THE GEOLOGY OF THE ENGLISH CHANNEL. 169 



calcareous sau Istone (Triassic), yielded pebbles of granitic, granitoid, and 

 quartzite rocks, with flints, thus confirming M. 40, five miles westward. 



On the chart here inserted the letter T indicates those dredgings 

 made by the Association in which New Bed rocks have been found ; 

 while Worth's records are marked T'. (Plate XV.) 



The point at which the imssiccge-beds above the Trias were found is 

 marked P.B,, and L indicates limestones and marls of Liassie type. 



CRETACEOUS. 



Inasmuch as flints are recorded from practically every dredging, it is 

 useless to place the localities on a special chart. 



A chart has, however, been prepared showing the distribution of 

 the hard yellow chalk. The northernmost location would appear to be 

 Hunt's H. 13, S.W. Ed.d.,15 miles; his record of "a small piece of buff- 

 coloured limestone, riddled through and through by molluscs and other 

 marine borers," probably refers to a piece of this chalk. From this 

 point to M. 41, a distance of, say, 11 miles, records are frequent in 

 the Association's dredgings. There is then a gap for about 14 miles, 

 and following this two localities occur, M. 58 and M. 67. (Plate XVI.) 



The affinities of this yellow chalk appear to be with the ' Melbourn 

 Eock,' described by Mr. A. J. Jukes-Browne, and later by the same 

 author in collaboration with Mr. W. Hill.^ 



Whether lithological similarity in this case implies identity of age 

 may be doubtful. But the writer is indebted to Mr. Jukes-Browne 

 for the loan of some slides from his collection, and finds much in 

 common between these and his own slides prepared from the dredged 

 material. Unfortunately the latter contains no recognisable remains 

 of any zonal fossils. If of the same age as the Melbourn Eock, the 

 specimens indicate a formation lying at the base of the Middle Chalk. 



EOCENE. 



The one block of Eocene limestone is of great interest ; it is large, 

 over one foot in length, fiat-bedded, and angular. From its nature it 

 cannot have travelled far and preserved its present form ; indeed, it 

 must practically have been taken m situ. 



The possibility of Eocene strata occupying some part of the western 

 bed of the English Channel had been recognised before this specimen 

 was taken, and the grounds for that recognition have been so well 

 summarised by Mr. Jukes-Browne, that no apology is needed for in- 

 serting here an extract from his work, l%e Building of the British Isles 

 (1892):— 



"From the superposition of marine limestones upon the lignitic 

 1 "The Melbourn Eock, etc.," Q.J.G.S., Vol. XLII, 1886, p. 216 et seq. 



